Wall-plaster.



' promotes UNITED: STAT-ES YVILLI'AM COALE, 0F "WARREN QI-ITO.

Application filed June 26,

1899. Serial'No; 721,917. (No specimens.)

' To (all whom it may concern:

Be it known that I, WILLIA COALE, a citizen of the United States, residing at Warren, in'the county of Trumbull and State of Ohio, have invented and produced anew and useful Composition of Matter to Plaster, of which the followingis a specificatron.

My composition consists of the ingredients, combined in the proportions and having each its office and equivalent,substantially as hereinafter described. Theingredients and their proportions are substantially as follows, assuming that all the measures are by avoirduois weight for a ton ortwo thousand pounds of the composition: calcined gypsum or plaster, about one-halfor fifty per cent. in weight; hydraulic cement, about one-fourth or twenty-five per cent. in weight; clay, about oneseventh in weight; li'm'e, about one-twelfth in weight; chemical stucco retarder, about seven pounds; fiber, about one-twentieth in weight, assuming that it is in a perfectly dry state and that wood fiber is-used. Oth'ertibers should be according to'weight and quality:

lhe above'proportions are necessarily approximate, because they may be varied both ways, more or less, and give very satisfactory might results. For example, the gypsum vary from one-third to two-thirds of the bulk or quantity, by weight, according to quickness desired in setting. The clay gives softness or plasticity, be used according as this particular quality may be desired. The lime also maybe varied from one-twentieth to one-fifth in proportion as compared to the other materials usedand flow and smoothness under the trowel, as well as hardness and durableness at last. A like variationmay be practiced in the use of the fiber, which may be a vegetable or other product; but suitably prepared wood fiber serves a very good purpose and forms the basis of my present estimates.

In lieu of the chemical stucco-retarder I may use any equivalent retarding material, of which there are several, especially such .as possess or contain suitable acids or 'a'cidcom pounds, and some kindsof clay answer the purpose measurably well, thepurpose of-this ingredient being to hinder or delay the setting of the plaster on the wall, andthus avoid be Used as a Wallan equivalent any product of cement-rock,

and such proportion thereof may f greater inherent strength and is g by surrou ndings,= as .quicklimeis known to be. e

cracking. commercial article known by this name and an earth product obtained in the State of Iowa, is a powerfulretarding agent, so that a rela- The stucco-retarder, which is a tively small quantity thereof serves the purpose; butits-office, though an important one ,in asense, is brief,as itis only intended to promote favorable. action of the plaster after being placed on the wall; Qnce on and set, the

retarder has probablylittle or no further value I of consequence 1n the composition A quick setting anddrying cemept ingredic'nt is used as a-per manent hardening substance to supplementiiithe quick setting and hardening,"but otherwise brittle, calcined plaster. *As an equivalent to calcined plaster any uick-settin g plaster or cementm ade from g psum-or kindred rock maybe used,and as of hydraulic cemcntl suggest marl, calcined clay, or prepared ;furnace-slag, such as is classed as Portland cement, water-lime,

or natural cement.

Clay is used chiefly to give the composition a soft, plastic eo'nsistency,and inthis function it is-materially assisted by thclime, the two ingredients making the com positionwhen-wct u p and ready the walls and ceilings.

SVater Sl-aked ground, y and :recarbon'ated lime is used in; preference to quicklimeor for use a plastic, smooth-work r in g'plaster, whiclrworks easily nnderjthe tools used to apply :it and to st-raighten'apd finish sl'aked lime, because, it? helps-to: prevent the dangerof shrinking or cracking, in the wall otherwise liable to occur: and possessesw'a notv affected ness with age and is likely to become rotten,

often very soon, becomes' rotten'cit is apt. to" fall on. "Such:

walls alsobecome brittle and crackcasily.

and being heavy when it is used as a filler andbindergand Iclaim tohave 'overcome'these objections and to have'made aplaster-which hasy-permanent hardness and adhesiveness when once settled on the wall and is a non-conductor of *itness my hand to the foregoing specifisound and of heat and of electricity. cation this 19th day of June, 1890.

\Vhab I claim is A composition of matter comprising caland the proportions substan- 5 cincd plaster, cement, clay, lime, fiber,

stucco-retardor in tiully as (Inscribed.

\VILLIAM COALE.

\Vi messes:

MAUI) E. LONG, JESSIE M. LITTLE. 

